Duplex milling-machine.



F. M. DAVIS. DUPLEX MILLING MACHINE. APPLICATION FILED FEB. 10. 1317.

Patented Sept. 17, 1918.

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F. M. DAVIS. DUPLEX MILLING MACHINE- APPLICATION nuzo FEB. 10, 1911.

FRANK M DAVIS, 0F MILWAUKEE, WISCONSIN.

DUPLEX MILLIN G-MACHIN E.

Specification of Letters Patent.

Patented Sept. 17, 1918..

Application filed February 10, 1917. Serial No. 147,911.

To all whom it may concern:

Be it known that I, FRANK M. DAVIS, a citizen of the United States, and resident of Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented new and useful Improvements in Duplex Milling- Machines, of which the following is a description, reference being had to the accompanying drawings, which are a part of this specification.

This invention relates to milling machines for use in large factories turning out numerous standardized parts and is designed for rapidly and simultaneously facing opposite sides of like pieces of work. It consists of a continuously driven table carrying the work between opposite pairs of milling heads to produce a roughing cut and then a finishing cut in the single cycle of travel and ermitting the finished work to be replaced y new Work without stopping the machine.

Another object of the invention is to produce such a continuously rotated table which may be easily replaced with another having a different arrangement of work holding jigs thereon, so that the change may be made from one article of work to another without loss of time in changing the jigs.

A further object of the invention is to so construct :1 work feeding table for such duplex milling machines that the Work holding jigs may be slidably adjusted thereon in a circular path and thus be positioned close together to permit the machine to operate at full capacity whether the work is of one size or another and avoid unnecessary loss of time incident to an increase in the space between successive pieces of work when the work is small and the jig positions are fixed.

With the above and other objects'in view the invention consists in the duplex milling machine as herein claimed and all equivalents.

Referring to the accompan ing drawing in which like characters of re erence indicate the same parts in the difi'erent views:

Figure 1 is a front view of a duplex milling machine of this inventionshowing. the rotary work feeding table;

Fig. 2 is an end view thereof showing the opposite milling cutters in successively operating pairs;

Fig. 3 is a plan view;

Fig. i is a detail view of a work feeding table removed from the machine and capable of having the work holding jigs adjustable in their positions thereon; and r Fig. 5 is a detail sectional view of a part of such work feeding table showing the means for clamping the jigs in their adjustments.

In these drawings 10 indicates a base on which is mounted the casing 11 containing the reduction gearing for the milling cut-' ters l2 and 13 which are mounted in pairs on two slidable housings 14 adjustableto- Ward and from each other in suitable ways 14 in the casing and base respectively. Thetwo upper cutters 12 are roughing cutters and have their axes in alinement while the two lower cutters are finishing cutters and also have their axes in alinement. Adjusting screws 114 are provided for sliding the housings 14 in their ways and clamping screws 114' serveto lock them in their adjustments.

On the angular projection of the base 10 is sliolably mounted in ways 15 a housing 15v in which is mounted a large tubular arbor 16 rotated by a clutch controlled worm gear driving means 17 sliding on a splined shaft 18 from the gear casing 11. The housing 15 is moved in its ways by means'of a feed screw 115.

Bolted, or otherwise removably fastened, to the annular flange of arbor 16 is a ring-- like Work table 19 with work holding jigs 20 suitably secured to its periphery which is of the shape of a polygon with as many sides as there are jigs, according to the length of the jigs suited to the work being operated upon. The jigs 20 are preferably keyed on the jig seats of the work table and are provided with clamping plates 21 to firmly clamp the'work 22 in place.

The adjustments of the work feeding table support 15 along the longitudinal horizontal ways of the base 10 permit the rotary work feeding table to be moved between the cutter heads 12 and 13 so that the path of travel of the work 22 will carry it between both sets of cutter heads in such a manner that all of the end surface thereof which is to be dressed is subjected. to the action of the roughing cutters and then of the finishing cutters. of each cutter housing 14011 the transverse horizontal ways 14 and the longitudinal "adjustment of the lower cutter spindle in said housing by means of adjusting screw The adjustment 214 permit of the cutter heads being accurately positioned to produce the desired depth of cut and accurately determine the length of the finished work from one dressed face thereof to the other.

In operation, the rotation of the work feeding table is continuous and at such a speed that the attendant is kept busy in removing the finished work from the jigs and clamping new work in place therein. This change is made when the jigs are in convenient position and without interrupting the rotary movement of the table." By means of the continuously moving rotating work feeding table'of this invention the cutters are kept constantly at work and are not required to run idle while the finished work is being replaced and the operator is kept engaged instead .of having to wait for the operation of the cutters. The capacity of the machine is greatly 1ncreased, while the cost of production is reduced and the work is finished in shorter time.

In changin from one standard piece of work to anot ier it is found desirable to replace the entire work feeding table with another equipped with the jigs for the new piece of work rather than to replace the jigs on the same table and this may easily be done by removing the clamping bolts holding the table on the flange of the arbor.

Such a spare or supplemental work feeding table is shown in Fig. A as a modification 19" of the form of table illustrated in Figs. 1, 2 and 3. This table is circular with a T-shaped slot extending around its periphcry to take the heads of clamping bolts 23 which are carried by the jigs 20. Each jig in' this instance has its bottom surface curved to fit the round rim of the table with a central key flange 2-1 fitting in the T-shaped slot to assist in holding it in place. One or more of the jigs 20' may be removed and the others shifted to stand the same distance apart, or jigs of different lengths may be substituted in order to accommodate work of any size without spacing several pieces of work apart more than is necessary, it being an object to arrange the pieces or work close together and avoid spaces in which the eutterswill be out of engagement with the work. i

It is tobe understood that the invention is not limited to any specific form or arrangement of parts except in so far as such limitations are specified in the claims.

lVhat I claim as new and desire to, secure by Letters Patent is:

1. A duplex milling machine, comprising oppositely positioned cutters independently mounted and spaced apart, a rotary table adjustably mounted to move between the cutters, means for securing the work on the table, and means for giving the table a continuous rotary movement to feed the work in a circular path which will carry it between t-hecutters, said securing means permitting the work to be removed and replaced during the turning movement of the table.

2. A continuous feed mechanism for du-. plex milling machines which have oppositely positioned spaced cutters independently mounted, comprising a suitably driven arbor, a work table detachably mounted there. on and turning in aplane parallel with and between the cutters, means for adjusting the arbor to move the table nearer to or farther from the axes of the cutters, and means for clamping the work on the edge of the table to pass between the cutters in the rotary travel of the table and have its opposite faces cut thereby.

3. A duplex milling machine for universal application, comprising oppositely posi tioned spaced rotary cutters independently mounted and adjustable toward and away from each other, a rotary table on an axis parallel with the axes of the cutters and traveling in a plane between the cutters, means for adjusting the table with relation to the cutters for bringing its axis nearer to or farther from the axes of the cutters, and work holding means at the edges of the table for carrying the work between the cutters during the turning of the table.

4. A duplex milling machine, comprising oppositely positioned rotary cutters, a rotary table on an axis parallel with the axis we of the cutters and in a plane between the cutters, and adjustable in said plane toward and away from the cutters, and work holding means at the edges of the table .for carrying the work between thecutters during 1&5 the circular travel of the table.

5. A duplex milling machine, comprising oppositely positioned rotary cutters adjustable toward and away from each other, a, rotary table on an axis parallel with the axis 110 of the cutters and in a plane between the cutters and adjustable in said plane toward and away from the cutters, and work holding means at the edges of the table for'carrying the work between the cutters during the cir- 115 cular travel of the table. I

6. A duplex milling machine, comprising pairs of oppositely positioned roughing and finishing cutters adjustable toward and away from each other, a rotary table on an 120 axis parallel with the axes of the cutters and in a plane between the cutters and adjustable in said plane toward and away from the cutters, and work holding means at the edges of the table for carrying the work be- 125 tween the roughing cutters and then the fin ishing cutters during the circular travel of the table.

7. A duplex milling machine, comprising a base, a casing thereon containing driving 1% gearing, -cutter housings longitudinally adjustable on the base toward and away from each other, oppositely positioned cutters on the cutter housings, a table sup orting housing slidably mounted on the base and adj ustable toward and away from the cutters, a suitably driven arbor rotatably mounted in the table supporting housing, a table detaohably secured to the arbor, and work holding means at the edges of the table for carrying the Work between the cutters.

8. A duplex milling machine, comprising oppositely positioned rotary cutters, a suitably driven arbor parallel withi the axis of the cutters, a table detachably mounted on the arbor, and work holding means at the edges of the table for carrying fie Work between the cutters.

9. In a continuous feed mechanism for duplex milling machines, a detachable circular table, and Work holding jigs slidably connected at the periphery thereof and adapted to be adjusted toward and away from each other.

10. In a continuous feed mechanism for duplex milling machines, a circular table FRANK M. DAVIS.

Witnesses R. S. C. CALDWELL, H. D. CHASE. 

